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Porous graphene supported carbon coated iron oxide nanoparticle composite material and preparation method thereof

An iron oxide nanometer, porous graphene technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of difficult to achieve large-scale production, high cost of graphene, complex equipment, etc., and achieve excellent cycle stability and good rate. performance, the effect of high lithium storage capacity

Active Publication Date: 2016-12-07
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Make the cost of prepared graphene higher
On the other hand, the equipment required to prepare this type of composite material is complicated, the operation is cumbersome, and the cost is high.
Therefore, it is difficult to achieve large-scale production

Method used

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  • Porous graphene supported carbon coated iron oxide nanoparticle composite material and preparation method thereof
  • Porous graphene supported carbon coated iron oxide nanoparticle composite material and preparation method thereof
  • Porous graphene supported carbon coated iron oxide nanoparticle composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A porous graphene-loaded carbon-coated iron oxide nanoparticle composite material is prepared through the following steps:

[0031] (1) Adopt airtight oxidation method to directly prepare graphene oxide with microcrystalline graphite ore as raw material. In the lined reaction kettle, take 30mL of concentrated sulfuric acid in another container, put the reaction kettle and concentrated sulfuric acid with graphite ore powder and potassium permanganate in the equipment with refrigeration function and refrigerate at low temperature (0°C) for 12h , then, add concentrated sulfuric acid into the reaction kettle with graphite ore powder and potassium permanganate, cover it, tighten the reaction kettle, put it in an oven at 90°C for 2 hours, and slowly pour the reaction product into the reaction kettle with a weight of Add hydrogen peroxide dropwise to water 20 times the weight of concentrated sulfuric acid until all of it turns yellow, then centrifugally wash with dilute hydroc...

Embodiment 2

[0041] A porous graphene-loaded carbon-coated iron oxide nanoparticle composite material is prepared through the following steps:

[0042] (1) Adopt airtight oxidation method to directly prepare graphene oxide with flake graphite ore as raw material, the specific steps are as follows: directly take 0.6g flake graphite ore powder (graphite content 60%), 3g potassium permanganate, place in polystetrafluoroethylene successively In the reaction kettle lined with vinyl fluoride, take 30mL of concentrated sulfuric acid in another container, put the reaction kettle with graphite ore powder and potassium permanganate and concentrated sulfuric acid in the equipment with refrigeration function at low temperature (-5 ℃ ) refrigerated for 12 hours, then, add concentrated sulfuric acid into the reaction kettle with graphite ore powder and potassium permanganate, cover it, tighten the reaction kettle, place it in a 90°C oven for 2 hours, and pour the reaction product slowly under vigorous st...

Embodiment 3

[0047] A porous graphene-loaded carbon-coated iron oxide nanoparticle composite material is prepared through the following steps:

[0048] (1) Adopt airtight oxidation method to directly prepare graphene oxide with flake graphite ore as raw material, concrete steps are as follows: directly take 0.5g flake graphite ore powder (graphite content 60%), 10g potassium permanganate, place in polystetrafluoroethylene successively Take 100mL of concentrated sulfuric acid in another container in the reaction kettle lined with vinyl fluoride, and place the reaction kettle with graphite ore powder and potassium permanganate and concentrated sulfuric acid in a device with refrigeration function at low temperature (-2°C) ) refrigerated for 12 hours, then, add concentrated sulfuric acid into the reaction kettle with graphite ore powder and potassium permanganate, cover it, tighten the reaction kettle, place it in a 100°C oven for 1 hour, and slowly pour the reaction product under vigorous sti...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and specifically relates to a porous graphene supported carbon coated iron oxide nanoparticle composite material and a preparation method thereof. The porous graphene supported carbon coated iron oxide nanoparticle composite material is prepared from the following steps: (1) directly preparing graphene oxide with graphite ore as a raw material by using a closed oxidation method; (2) preparing a ferric salt aqueous solution, wherein the specific steps are as follows: weighing and dissolving cetyl trimethyl ammonium bromide in water to obtain a clear cetyl trimethyl ammonium bromide solution, adding a ferric salt, stirring until the ferric salt is completely dissolved, and adding an ammonia solution to prepare the ferric salt aqueous solution; and (3) stirring and ultrasonic mixing the graphene oxide solution with the ferric salt aqueous solution, placing the mixture in a water bath kettle, reacting at 80-100 DEG C for 0.5-5h, stewing at a room temperature, removing clear liquid, freeze drying a head product, and carrying out heat treatment on the head product in an inert atmosphere to obtain the porous graphene supported carbon coated iron oxide nanoparticle composite material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a porous graphene-loaded carbon-coated iron oxide nanoparticle composite material and a preparation method. Background technique [0002] Lithium-ion batteries have high energy density, light weight, and long service life. They are currently widely used in mobile applications, such as laptops, cameras, and mobile phones. At the same time, lithium-ion batteries are being selected as power batteries by more and more electric vehicle manufacturers. However, the current commercialized secondary lithium-ion batteries use graphite as the negative electrode material, which has high Coulombic efficiency (>90%), but the theoretical capacity is relatively low, and the rate performance is relatively poor. This application field has higher requirements for the rapidly increasing specific capacity, rate performance and cycle life of lithium-ion batteries....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62
CPCH01M4/362H01M4/587H01M4/625Y02E60/10
Inventor 马灿良赵云
Owner SHANXI UNIV
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